\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Reiner Martin (Reiner Martin)}
\pdfinfo{
  /Title (rust-essentials.pdf)
  /Creator (Cheatography)
  /Author (Reiner Martin (Reiner Martin))
  /Subject (Rust Essentials Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{5C5C5C}
\definecolor{LightBackground}{HTML}{F4F4F4}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Rust Essentials Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Reiner Martin (Reiner Martin)} via \textcolor{DarkBackground}{\uline{cheatography.com/40644/cs/12466/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Reiner Martin (Reiner Martin) \\
  \uline{cheatography.com/reiner-martin} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 25th January, 2018.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{x{3.6 cm} x{4.4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{HashMaps}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{use \seqsplit{std::collections::HashMap;}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{let mut h: HashMap\textless{}(i64,i64),i64\textgreater{} = HashMap::new();} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{h.contains\_key(\&(n},k)) & check whether key is present \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
h.insert((n,k), res); & insert new value \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
*h.get(\&(n,k)).unwrap() & retrieve value \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.44 cm} x{4.56 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Variables and constants}}  \tn
% Row 0
\SetRowColor{LightBackground}
const N: i32 = 5 & (Global) constant \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
let v = vec!{[}3, 1, 4{]} & Define and initialize vector \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{let zero\_vec = vec!{[}0; len{]}} \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{let mut p : {[}usize; 9{]} = {[}0; 9{]};} \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.8 cm} x{5.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Primitive types}}  \tn
% Row 0
\SetRowColor{LightBackground}
bool & Boolean \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
char & character \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
f32, f64 & 32-bits, 64-bits floats \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
i64, i32, i16, i8 & signed 16- ... integers \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
u64, u32, u16, u8 & unsigned 16-bits, ...  integers \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
isize & pointer-sized signed integers \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
usize & pointer-sized unsigned integers \tn 
% Row Count 11 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Processor directives}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{\#!{[}feature(iterator\_step\_by){]}} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}for n in (0..100).step\_by(2) \{ ... \} iterates over even numbers} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{\#!{[}feature(inclusive\_range\_syntax){]}} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}1..=n is a range which includes both 1 and n} \tn 
% Row Count 6 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.8 cm} x{5.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Boolean operators}}  \tn
% Row 0
\SetRowColor{LightBackground}
Operator & Syntax \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
And & a \& b or a \&\& b \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Or & a . b or a .. b \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
And & a \textasciicircum{} b \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Not & !a \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Conversions}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{To convert say an `n: i32` to a `u64` use `n as u64`} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{To convert a number `x` to a string use `x.to\_string()`} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{To convert `s: String*` to `x.parse().unwrap()`} \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{\seqsplit{`x.unwrap\_or(default\_value)`}} \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.6 cm} x{4.4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Formatting}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{println!("\{\}", x);} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
println!("\{:010b\}", x); & binary, 10 digits, print leading zeros \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
format!("Hello"); & "Hello" \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
format!("Hello, \{\}!", "world"); & "Hello, world!" \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
format!("The number is \{\}", 1); & "The number is 1" \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
format!("\{:?\}", (3, 4)); & "4" \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
format!("\{value\}", value=4); & "1 2" \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
format!("\{:04\}", 42); & "0042" with leading zeros \tn 
% Row Count 14 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Vectors and iterators}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{(0..16usize).map(|x| x.count\_ones() as usize).collect()} \tn 
% Row Count 2 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Assertions}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{let x = 42; \newline assert!(x == 42); \newline assert\_eq!(x, 42);} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Use the macro `assert!` to check for a boolean true, and `assert\_eq!` for the equality of two expressions.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}